One more question. My tank is 36 inches long. The razor 150 is 27 inches long and the razor 200 is 33 inches long. They both will cover the tank. But I'd like to keep the lights lower to the tank than higher. I'm thinking if I go with the shorter 150 I'd have to keep the light higher so that is covers the tank. If I go with the longer light, the 200, it would cover more of the tank at a lower height. Is this correct?